Mercurial > hg
annotate rust/hg-core/src/revlog/index.rs @ 51226:83091c14058c
rust-index: avoid some cloning in find_gca_candidates()
Instead of keeping the information whether the current revision is
poisoned on `current_seen`, we extract it as a boolean.
This also allows us to simplify the explanation of `seen[r].is_poisoned()`,
as the exceptional case where it is poisoned right after `r` has been
determined to be a solution does no longer exist.
author | Georges Racinet <georges.racinet@octobus.net> |
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date | Fri, 20 Oct 2023 08:17:00 +0200 |
parents | 89ce6a49bfeb |
children | e553cd209215 |
rev | line source |
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1 use std::collections::hash_map::RandomState; |
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2 use std::collections::{HashMap, HashSet}; |
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3 use std::fmt::Debug; |
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4 use std::ops::Deref; |
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5 use std::sync::{RwLock, RwLockReadGuard, RwLockWriteGuard}; |
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6 |
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7 use byteorder::{BigEndian, ByteOrder}; |
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8 use bytes_cast::{unaligned, BytesCast}; |
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9 |
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10 use super::REVIDX_KNOWN_FLAGS; |
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11 use crate::errors::HgError; |
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12 use crate::node::{NODE_BYTES_LENGTH, NULL_NODE, STORED_NODE_ID_BYTES}; |
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13 use crate::revlog::node::Node; |
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14 use crate::revlog::{Revision, NULL_REVISION}; |
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15 use crate::{ |
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16 dagops, BaseRevision, FastHashMap, Graph, GraphError, RevlogError, |
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17 RevlogIndex, UncheckedRevision, |
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18 }; |
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19 |
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20 pub const INDEX_ENTRY_SIZE: usize = 64; |
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21 pub const COMPRESSION_MODE_INLINE: u8 = 2; |
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22 |
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23 #[derive(Debug)] |
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24 pub struct IndexHeader { |
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25 pub(super) header_bytes: [u8; 4], |
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26 } |
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27 |
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28 #[derive(Copy, Clone)] |
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29 pub struct IndexHeaderFlags { |
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30 flags: u16, |
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31 } |
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32 |
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33 /// Corresponds to the high bits of `_format_flags` in python |
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34 impl IndexHeaderFlags { |
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35 /// Corresponds to FLAG_INLINE_DATA in python |
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36 pub fn is_inline(self) -> bool { |
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37 self.flags & 1 != 0 |
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38 } |
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39 /// Corresponds to FLAG_GENERALDELTA in python |
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40 pub fn uses_generaldelta(self) -> bool { |
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41 self.flags & 2 != 0 |
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42 } |
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43 } |
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44 |
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45 /// Corresponds to the INDEX_HEADER structure, |
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46 /// which is parsed as a `header` variable in `_loadindex` in `revlog.py` |
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47 impl IndexHeader { |
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48 fn format_flags(&self) -> IndexHeaderFlags { |
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49 // No "unknown flags" check here, unlike in python. Maybe there should |
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50 // be. |
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51 IndexHeaderFlags { |
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52 flags: BigEndian::read_u16(&self.header_bytes[0..2]), |
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53 } |
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54 } |
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55 |
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56 /// The only revlog version currently supported by rhg. |
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57 const REVLOGV1: u16 = 1; |
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58 |
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59 /// Corresponds to `_format_version` in Python. |
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60 fn format_version(&self) -> u16 { |
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61 BigEndian::read_u16(&self.header_bytes[2..4]) |
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62 } |
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63 |
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64 pub fn parse(index_bytes: &[u8]) -> Result<Option<IndexHeader>, HgError> { |
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65 if index_bytes.is_empty() { |
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66 return Ok(None); |
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67 } |
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68 if index_bytes.len() < 4 { |
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69 return Err(HgError::corrupted( |
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70 "corrupted revlog: can't read the index format header", |
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71 )); |
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72 } |
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73 Ok(Some(IndexHeader { |
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74 header_bytes: { |
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75 let bytes: [u8; 4] = |
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76 index_bytes[0..4].try_into().expect("impossible"); |
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77 bytes |
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78 }, |
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79 })) |
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80 } |
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81 } |
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82 |
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83 /// Abstracts the access to the index bytes since they can be spread between |
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84 /// the immutable (bytes) part and the mutable (added) part if any appends |
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85 /// happened. This makes it transparent for the callers. |
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86 struct IndexData { |
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87 /// Immutable bytes, most likely taken from disk |
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88 bytes: Box<dyn Deref<Target = [u8]> + Send>, |
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89 /// Used when stripping index contents, keeps track of the start of the |
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90 /// first stripped revision, which is used to give a slice of the |
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91 /// `bytes` field. |
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92 truncation: Option<usize>, |
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93 /// Bytes that were added after reading the index |
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94 added: Vec<u8>, |
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95 } |
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96 |
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97 impl IndexData { |
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98 pub fn new(bytes: Box<dyn Deref<Target = [u8]> + Send>) -> Self { |
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99 Self { |
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100 bytes, |
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101 truncation: None, |
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102 added: vec![], |
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103 } |
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104 } |
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105 |
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106 pub fn len(&self) -> usize { |
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107 match self.truncation { |
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108 Some(truncation) => truncation + self.added.len(), |
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109 None => self.bytes.len() + self.added.len(), |
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110 } |
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111 } |
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112 |
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113 fn remove( |
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114 &mut self, |
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115 rev: Revision, |
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116 offsets: Option<&[usize]>, |
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117 ) -> Result<(), RevlogError> { |
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118 let rev = rev.0 as usize; |
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119 let truncation = if let Some(offsets) = offsets { |
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120 offsets[rev] |
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121 } else { |
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122 rev * INDEX_ENTRY_SIZE |
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123 }; |
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124 if truncation < self.bytes.len() { |
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125 self.truncation = Some(truncation); |
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126 self.added.clear(); |
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127 } else { |
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128 self.added.truncate(truncation - self.bytes.len()); |
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129 } |
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130 Ok(()) |
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131 } |
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132 |
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133 fn is_new(&self) -> bool { |
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134 self.bytes.is_empty() |
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135 } |
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136 } |
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137 |
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138 impl std::ops::Index<std::ops::Range<usize>> for IndexData { |
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139 type Output = [u8]; |
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140 |
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141 fn index(&self, index: std::ops::Range<usize>) -> &Self::Output { |
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142 let start = index.start; |
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143 let end = index.end; |
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144 let immutable_len = match self.truncation { |
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145 Some(truncation) => truncation, |
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146 None => self.bytes.len(), |
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147 }; |
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148 if start < immutable_len { |
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149 if end > immutable_len { |
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150 panic!("index data cannot span existing and added ranges"); |
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151 } |
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152 &self.bytes[index] |
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153 } else { |
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154 &self.added[start - immutable_len..end - immutable_len] |
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155 } |
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156 } |
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157 } |
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158 |
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159 #[derive(Debug, PartialEq, Eq)] |
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160 pub struct RevisionDataParams { |
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161 pub flags: u16, |
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162 pub data_offset: u64, |
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163 pub data_compressed_length: i32, |
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164 pub data_uncompressed_length: i32, |
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165 pub data_delta_base: i32, |
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166 pub link_rev: i32, |
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167 pub parent_rev_1: i32, |
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168 pub parent_rev_2: i32, |
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169 pub node_id: [u8; NODE_BYTES_LENGTH], |
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170 pub _sidedata_offset: u64, |
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171 pub _sidedata_compressed_length: i32, |
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172 pub data_compression_mode: u8, |
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173 pub _sidedata_compression_mode: u8, |
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174 pub _rank: i32, |
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175 } |
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176 |
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177 impl Default for RevisionDataParams { |
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178 fn default() -> Self { |
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179 Self { |
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180 flags: 0, |
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181 data_offset: 0, |
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182 data_compressed_length: 0, |
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183 data_uncompressed_length: 0, |
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184 data_delta_base: -1, |
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185 link_rev: -1, |
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186 parent_rev_1: -1, |
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187 parent_rev_2: -1, |
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188 node_id: [0; NODE_BYTES_LENGTH], |
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189 _sidedata_offset: 0, |
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190 _sidedata_compressed_length: 0, |
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191 data_compression_mode: COMPRESSION_MODE_INLINE, |
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192 _sidedata_compression_mode: COMPRESSION_MODE_INLINE, |
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193 _rank: -1, |
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194 } |
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195 } |
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196 } |
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197 |
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198 #[derive(BytesCast)] |
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199 #[repr(C)] |
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200 pub struct RevisionDataV1 { |
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201 data_offset_or_flags: unaligned::U64Be, |
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202 data_compressed_length: unaligned::I32Be, |
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203 data_uncompressed_length: unaligned::I32Be, |
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204 data_delta_base: unaligned::I32Be, |
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205 link_rev: unaligned::I32Be, |
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206 parent_rev_1: unaligned::I32Be, |
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207 parent_rev_2: unaligned::I32Be, |
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208 node_id: [u8; STORED_NODE_ID_BYTES], |
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209 } |
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210 |
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211 fn _static_assert_size_of_revision_data_v1() { |
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212 let _ = std::mem::transmute::<RevisionDataV1, [u8; 64]>; |
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213 } |
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214 |
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215 impl RevisionDataParams { |
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216 pub fn validate(&self) -> Result<(), RevlogError> { |
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217 if self.flags & !REVIDX_KNOWN_FLAGS != 0 { |
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218 return Err(RevlogError::corrupted(format!( |
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219 "unknown revlog index flags: {}", |
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220 self.flags |
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221 ))); |
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222 } |
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223 if self.data_compression_mode != COMPRESSION_MODE_INLINE { |
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224 return Err(RevlogError::corrupted(format!( |
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225 "invalid data compression mode: {}", |
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226 self.data_compression_mode |
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227 ))); |
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228 } |
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229 // FIXME isn't this only for v2 or changelog v2? |
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230 if self._sidedata_compression_mode != COMPRESSION_MODE_INLINE { |
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231 return Err(RevlogError::corrupted(format!( |
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232 "invalid sidedata compression mode: {}", |
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233 self._sidedata_compression_mode |
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234 ))); |
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235 } |
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236 Ok(()) |
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237 } |
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238 |
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239 pub fn into_v1(self) -> RevisionDataV1 { |
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240 let data_offset_or_flags = self.data_offset << 16 | self.flags as u64; |
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241 let mut node_id = [0; STORED_NODE_ID_BYTES]; |
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242 node_id[..NODE_BYTES_LENGTH].copy_from_slice(&self.node_id); |
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243 RevisionDataV1 { |
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244 data_offset_or_flags: data_offset_or_flags.into(), |
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245 data_compressed_length: self.data_compressed_length.into(), |
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246 data_uncompressed_length: self.data_uncompressed_length.into(), |
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247 data_delta_base: self.data_delta_base.into(), |
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248 link_rev: self.link_rev.into(), |
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249 parent_rev_1: self.parent_rev_1.into(), |
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250 parent_rev_2: self.parent_rev_2.into(), |
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251 node_id, |
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252 } |
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253 } |
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254 } |
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255 |
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256 /// A Revlog index |
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257 pub struct Index { |
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258 bytes: IndexData, |
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259 /// Offsets of starts of index blocks. |
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260 /// Only needed when the index is interleaved with data. |
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261 offsets: RwLock<Option<Vec<usize>>>, |
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262 uses_generaldelta: bool, |
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263 is_inline: bool, |
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264 /// Cache of the head revisions in this index, kept in sync. Should |
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265 /// be accessed via the [`Self::head_revs`] method. |
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266 head_revs: Vec<Revision>, |
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267 /// Cache of the last filtered revisions in this index, used to make sure |
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268 /// we haven't changed filters when returning the cached `head_revs`. |
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269 filtered_revs: HashSet<Revision>, |
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270 } |
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271 |
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272 impl Debug for Index { |
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273 fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { |
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274 f.debug_struct("Index") |
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275 .field("offsets", &self.offsets) |
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276 .field("uses_generaldelta", &self.uses_generaldelta) |
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277 .finish() |
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278 } |
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279 } |
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280 |
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281 impl Graph for Index { |
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282 fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError> { |
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283 let err = || GraphError::ParentOutOfRange(rev); |
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284 match self.get_entry(rev) { |
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285 Some(entry) => { |
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286 // The C implementation checks that the parents are valid |
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287 // before returning |
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288 Ok([ |
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289 self.check_revision(entry.p1()).ok_or_else(err)?, |
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290 self.check_revision(entry.p2()).ok_or_else(err)?, |
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291 ]) |
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292 } |
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293 None => Ok([NULL_REVISION, NULL_REVISION]), |
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294 } |
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295 } |
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296 } |
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297 |
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298 /// A cache suitable for find_snapshots |
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299 /// |
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300 /// Logically equivalent to a mapping whose keys are [`BaseRevision`] and |
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301 /// values sets of [`BaseRevision`] |
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302 /// |
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303 /// TODO the dubious part is insisting that errors must be RevlogError |
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304 /// we would probably need to sprinkle some magic here, such as an associated |
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305 /// type that would be Into<RevlogError> but even that would not be |
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306 /// satisfactory, as errors potentially have nothing to do with the revlog. |
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307 pub trait SnapshotsCache { |
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308 fn insert_for( |
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309 &mut self, |
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310 rev: BaseRevision, |
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311 value: BaseRevision, |
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312 ) -> Result<(), RevlogError>; |
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313 } |
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314 |
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315 impl SnapshotsCache for FastHashMap<BaseRevision, HashSet<BaseRevision>> { |
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316 fn insert_for( |
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317 &mut self, |
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318 rev: BaseRevision, |
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319 value: BaseRevision, |
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320 ) -> Result<(), RevlogError> { |
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321 let all_values = self.entry(rev).or_insert_with(HashSet::new); |
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322 all_values.insert(value); |
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323 Ok(()) |
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324 } |
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325 } |
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326 |
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327 impl Index { |
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328 /// Create an index from bytes. |
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329 /// Calculate the start of each entry when is_inline is true. |
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330 pub fn new( |
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331 bytes: Box<dyn Deref<Target = [u8]> + Send>, |
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332 default_header: IndexHeader, |
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333 ) -> Result<Self, HgError> { |
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334 let header = |
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335 IndexHeader::parse(bytes.as_ref())?.unwrap_or(default_header); |
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336 |
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337 if header.format_version() != IndexHeader::REVLOGV1 { |
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338 // A proper new version should have had a repo/store |
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339 // requirement. |
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340 return Err(HgError::corrupted("unsupported revlog version")); |
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341 } |
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342 |
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343 // This is only correct because we know version is REVLOGV1. |
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344 // In v2 we always use generaldelta, while in v0 we never use |
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345 // generaldelta. Similar for [is_inline] (it's only used in v1). |
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346 let uses_generaldelta = header.format_flags().uses_generaldelta(); |
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347 |
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348 if header.format_flags().is_inline() { |
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349 let mut offset: usize = 0; |
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350 let mut offsets = Vec::new(); |
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351 |
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352 while offset + INDEX_ENTRY_SIZE <= bytes.len() { |
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353 offsets.push(offset); |
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354 let end = offset + INDEX_ENTRY_SIZE; |
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355 let entry = IndexEntry { |
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356 bytes: &bytes[offset..end], |
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357 offset_override: None, |
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358 }; |
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359 |
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360 offset += INDEX_ENTRY_SIZE + entry.compressed_len() as usize; |
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361 } |
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362 |
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363 if offset == bytes.len() { |
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364 Ok(Self { |
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365 bytes: IndexData::new(bytes), |
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366 offsets: RwLock::new(Some(offsets)), |
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367 uses_generaldelta, |
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368 is_inline: true, |
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369 head_revs: vec![], |
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370 filtered_revs: HashSet::new(), |
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371 }) |
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372 } else { |
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373 Err(HgError::corrupted("unexpected inline revlog length")) |
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374 } |
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375 } else { |
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376 Ok(Self { |
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377 bytes: IndexData::new(bytes), |
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378 offsets: RwLock::new(None), |
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379 uses_generaldelta, |
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380 is_inline: false, |
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381 head_revs: vec![], |
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382 filtered_revs: HashSet::new(), |
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383 }) |
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384 } |
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385 } |
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386 |
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387 pub fn uses_generaldelta(&self) -> bool { |
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388 self.uses_generaldelta |
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389 } |
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390 |
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391 /// Value of the inline flag. |
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392 pub fn is_inline(&self) -> bool { |
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393 self.is_inline |
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394 } |
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395 |
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396 /// Return a slice of bytes if `revlog` is inline. Panic if not. |
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397 pub fn data(&self, start: usize, end: usize) -> &[u8] { |
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398 if !self.is_inline() { |
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399 panic!("tried to access data in the index of a revlog that is not inline"); |
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400 } |
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401 &self.bytes[start..end] |
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402 } |
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403 |
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404 /// Return number of entries of the revlog index. |
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405 pub fn len(&self) -> usize { |
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406 if let Some(offsets) = &*self.get_offsets() { |
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407 offsets.len() |
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408 } else { |
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409 self.bytes.len() / INDEX_ENTRY_SIZE |
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410 } |
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411 } |
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412 |
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413 pub fn get_offsets(&self) -> RwLockReadGuard<Option<Vec<usize>>> { |
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414 if self.is_inline() { |
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415 { |
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416 // Wrap in a block to drop the read guard |
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417 // TODO perf? |
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418 let mut offsets = self.offsets.write().unwrap(); |
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419 if offsets.is_none() { |
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420 offsets.replace(inline_scan(&self.bytes.bytes).1); |
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421 } |
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422 } |
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423 } |
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424 self.offsets.read().unwrap() |
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425 } |
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426 |
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427 pub fn get_offsets_mut(&mut self) -> RwLockWriteGuard<Option<Vec<usize>>> { |
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428 let mut offsets = self.offsets.write().unwrap(); |
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429 if self.is_inline() && offsets.is_none() { |
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430 offsets.replace(inline_scan(&self.bytes.bytes).1); |
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431 } |
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432 offsets |
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433 } |
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434 |
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435 /// Returns `true` if the `Index` has zero `entries`. |
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436 pub fn is_empty(&self) -> bool { |
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437 self.len() == 0 |
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438 } |
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439 |
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440 /// Return the index entry corresponding to the given revision or `None` |
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441 /// for [`NULL_REVISION`] |
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442 /// |
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443 /// The specified revision being of the checked type, it always exists |
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444 /// if it was validated by this index. |
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445 pub fn get_entry(&self, rev: Revision) -> Option<IndexEntry> { |
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446 if rev == NULL_REVISION { |
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447 return None; |
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448 } |
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449 Some(if let Some(offsets) = &*self.get_offsets() { |
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450 self.get_entry_inline(rev, offsets.as_ref()) |
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451 } else { |
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452 self.get_entry_separated(rev) |
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453 }) |
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454 } |
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455 |
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456 /// Return the binary content of the index entry for the given revision |
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457 /// |
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458 /// See [get_entry()](`Self::get_entry()`) for cases when `None` is |
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459 /// returned. |
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460 pub fn entry_binary(&self, rev: Revision) -> Option<&[u8]> { |
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461 self.get_entry(rev).map(|e| { |
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462 let bytes = e.as_bytes(); |
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463 if rev.0 == 0 { |
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464 &bytes[4..] |
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465 } else { |
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466 bytes |
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467 } |
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468 }) |
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469 } |
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470 |
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471 pub fn entry_as_params( |
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472 &self, |
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473 rev: UncheckedRevision, |
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474 ) -> Option<RevisionDataParams> { |
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475 let rev = self.check_revision(rev)?; |
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476 self.get_entry(rev).map(|e| RevisionDataParams { |
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477 flags: e.flags(), |
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478 data_offset: if rev.0 == 0 && !self.bytes.is_new() { |
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479 e.flags() as u64 |
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480 } else { |
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481 e.raw_offset() |
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482 }, |
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483 data_compressed_length: e.compressed_len().try_into().unwrap(), |
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484 data_uncompressed_length: e.uncompressed_len(), |
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485 data_delta_base: e.base_revision_or_base_of_delta_chain().0, |
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486 link_rev: e.link_revision().0, |
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487 parent_rev_1: e.p1().0, |
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488 parent_rev_2: e.p2().0, |
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489 node_id: e.hash().as_bytes().try_into().unwrap(), |
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490 ..Default::default() |
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491 }) |
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492 } |
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493 |
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494 fn get_entry_inline( |
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495 &self, |
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496 rev: Revision, |
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497 offsets: &[usize], |
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498 ) -> IndexEntry { |
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499 let start = offsets[rev.0 as usize]; |
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500 let end = start + INDEX_ENTRY_SIZE; |
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501 let bytes = &self.bytes[start..end]; |
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502 |
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503 // See IndexEntry for an explanation of this override. |
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504 let offset_override = Some(end); |
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505 |
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506 IndexEntry { |
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507 bytes, |
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508 offset_override, |
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509 } |
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510 } |
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511 |
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512 fn get_entry_separated(&self, rev: Revision) -> IndexEntry { |
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513 let start = rev.0 as usize * INDEX_ENTRY_SIZE; |
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514 let end = start + INDEX_ENTRY_SIZE; |
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515 let bytes = &self.bytes[start..end]; |
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516 |
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517 // Override the offset of the first revision as its bytes are used |
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518 // for the index's metadata (saving space because it is always 0) |
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519 let offset_override = if rev == Revision(0) { Some(0) } else { None }; |
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520 |
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521 IndexEntry { |
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522 bytes, |
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523 offset_override, |
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524 } |
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525 } |
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526 |
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527 fn null_entry(&self) -> IndexEntry { |
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528 IndexEntry { |
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529 bytes: &[0; INDEX_ENTRY_SIZE], |
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530 offset_override: Some(0), |
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531 } |
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532 } |
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533 |
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534 /// Return the head revisions of this index |
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535 pub fn head_revs(&mut self) -> Result<Vec<Revision>, GraphError> { |
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536 self.head_revs_filtered(&HashSet::new()) |
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537 } |
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538 |
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539 /// Return the head revisions of this index |
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540 pub fn head_revs_filtered( |
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541 &mut self, |
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542 filtered_revs: &HashSet<Revision>, |
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543 ) -> Result<Vec<Revision>, GraphError> { |
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544 if !self.head_revs.is_empty() && filtered_revs == &self.filtered_revs { |
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545 return Ok(self.head_revs.to_owned()); |
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546 } |
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547 let mut revs: HashSet<Revision, RandomState> = |
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548 if filtered_revs.is_empty() { |
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549 (0..self.len()) |
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550 .into_iter() |
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551 .map(|i| Revision(i as BaseRevision)) |
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552 .collect() |
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553 } else { |
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554 (0..self.len()) |
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555 .into_iter() |
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556 .filter_map(|i| { |
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557 let r = Revision(i as BaseRevision); |
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558 if filtered_revs.contains(&r) { |
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559 None |
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560 } else { |
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561 Some(r) |
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562 } |
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563 }) |
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564 .collect() |
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565 }; |
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566 dagops::retain_heads(self, &mut revs)?; |
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567 if self.is_empty() { |
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568 revs.insert(NULL_REVISION); |
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569 } |
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570 let mut as_vec: Vec<Revision> = |
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571 revs.into_iter().map(Into::into).collect(); |
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572 as_vec.sort_unstable(); |
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573 self.head_revs = as_vec.to_owned(); |
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574 self.filtered_revs = filtered_revs.to_owned(); |
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575 Ok(as_vec) |
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576 } |
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577 |
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578 /// Obtain the delta chain for a revision. |
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579 /// |
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580 /// `stop_rev` specifies a revision to stop at. If not specified, we |
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581 /// stop at the base of the chain. |
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582 /// |
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583 /// Returns a 2-tuple of (chain, stopped) where `chain` is a vec of |
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584 /// revs in ascending order and `stopped` is a bool indicating whether |
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585 /// `stoprev` was hit. |
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586 pub fn delta_chain( |
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587 &self, |
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588 rev: Revision, |
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589 stop_rev: Option<Revision>, |
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590 ) -> Result<(Vec<Revision>, bool), HgError> { |
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591 let mut current_rev = rev; |
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592 let mut entry = self.get_entry(rev).unwrap(); |
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593 let mut chain = vec![]; |
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594 while current_rev.0 != entry.base_revision_or_base_of_delta_chain().0 |
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595 && stop_rev.map(|r| r != current_rev).unwrap_or(true) |
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596 { |
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597 chain.push(current_rev); |
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598 let new_rev = if self.uses_generaldelta() { |
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599 entry.base_revision_or_base_of_delta_chain() |
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600 } else { |
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601 UncheckedRevision(current_rev.0 - 1) |
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602 }; |
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603 current_rev = self.check_revision(new_rev).ok_or_else(|| { |
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604 HgError::corrupted(format!("Revision {new_rev} out of range")) |
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605 })?; |
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606 if current_rev.0 == NULL_REVISION.0 { |
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607 break; |
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608 } |
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609 entry = self.get_entry(current_rev).unwrap() |
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610 } |
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611 |
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612 let stopped = if stop_rev.map(|r| current_rev == r).unwrap_or(false) { |
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613 true |
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614 } else { |
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615 chain.push(current_rev); |
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616 false |
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617 }; |
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618 chain.reverse(); |
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619 Ok((chain, stopped)) |
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620 } |
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621 |
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622 pub fn find_snapshots( |
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623 &self, |
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624 start_rev: UncheckedRevision, |
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625 end_rev: UncheckedRevision, |
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626 cache: &mut impl SnapshotsCache, |
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627 ) -> Result<(), RevlogError> { |
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628 let mut start_rev = start_rev.0; |
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629 let mut end_rev = end_rev.0; |
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630 end_rev += 1; |
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631 let len = self.len().try_into().unwrap(); |
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632 if end_rev > len { |
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633 end_rev = len; |
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634 } |
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635 if start_rev < 0 { |
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636 start_rev = 0; |
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637 } |
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638 for rev in start_rev..end_rev { |
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639 if !self.is_snapshot_unchecked(Revision(rev))? { |
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640 continue; |
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641 } |
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642 let mut base = self |
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643 .get_entry(Revision(rev)) |
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644 .unwrap() |
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645 .base_revision_or_base_of_delta_chain(); |
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646 if base.0 == rev { |
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647 base = NULL_REVISION.into(); |
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648 } |
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649 cache.insert_for(base.0, rev)?; |
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650 } |
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651 Ok(()) |
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652 } |
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653 |
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654 /// TODO move this to the trait probably, along with other things |
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655 pub fn append( |
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656 &mut self, |
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657 revision_data: RevisionDataParams, |
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658 ) -> Result<(), RevlogError> { |
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659 revision_data.validate()?; |
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660 let new_offset = self.bytes.len(); |
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661 if let Some(offsets) = &mut *self.get_offsets_mut() { |
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662 offsets.push(new_offset) |
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663 } |
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664 self.bytes.added.extend(revision_data.into_v1().as_bytes()); |
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665 self.head_revs.clear(); |
51189
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666 Ok(()) |
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667 } |
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668 |
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669 pub fn pack_header(&self, header: i32) -> [u8; 4] { |
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670 header.to_be_bytes() |
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671 } |
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672 |
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673 pub fn remove(&mut self, rev: Revision) -> Result<(), RevlogError> { |
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674 let offsets = self.get_offsets().clone(); |
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675 self.bytes.remove(rev, offsets.as_deref())?; |
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676 if let Some(offsets) = &mut *self.get_offsets_mut() { |
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677 offsets.truncate(rev.0 as usize) |
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678 } |
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679 self.head_revs.clear(); |
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680 Ok(()) |
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681 } |
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682 |
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683 pub fn clear_caches(&mut self) { |
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684 // We need to get the 'inline' value from Python at init and use this |
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685 // instead of offsets to determine whether we're inline since we might |
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686 // clear caches. This implies re-populating the offsets on-demand. |
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687 self.offsets = RwLock::new(None); |
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688 self.head_revs.clear(); |
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689 } |
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690 |
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691 /// Unchecked version of `is_snapshot`. |
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692 /// Assumes the caller checked that `rev` is within a valid revision range. |
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693 pub fn is_snapshot_unchecked( |
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694 &self, |
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695 mut rev: Revision, |
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696 ) -> Result<bool, RevlogError> { |
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697 while rev.0 >= 0 { |
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698 let entry = self.get_entry(rev).unwrap(); |
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699 let mut base = entry.base_revision_or_base_of_delta_chain().0; |
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700 if base == rev.0 { |
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701 base = NULL_REVISION.0; |
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702 } |
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703 if base == NULL_REVISION.0 { |
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704 return Ok(true); |
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705 } |
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706 let [mut p1, mut p2] = self |
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707 .parents(rev) |
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708 .map_err(|_| RevlogError::InvalidRevision)?; |
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709 while let Some(p1_entry) = self.get_entry(p1) { |
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710 if p1_entry.compressed_len() != 0 || p1.0 == 0 { |
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711 break; |
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712 } |
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713 let parent_base = |
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714 p1_entry.base_revision_or_base_of_delta_chain(); |
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715 if parent_base.0 == p1.0 { |
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716 break; |
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717 } |
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718 p1 = self |
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719 .check_revision(parent_base) |
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720 .ok_or(RevlogError::InvalidRevision)?; |
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721 } |
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722 while let Some(p2_entry) = self.get_entry(p2) { |
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723 if p2_entry.compressed_len() != 0 || p2.0 == 0 { |
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724 break; |
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725 } |
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726 let parent_base = |
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727 p2_entry.base_revision_or_base_of_delta_chain(); |
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728 if parent_base.0 == p2.0 { |
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729 break; |
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730 } |
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731 p2 = self |
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732 .check_revision(parent_base) |
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733 .ok_or(RevlogError::InvalidRevision)?; |
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734 } |
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735 if base == p1.0 || base == p2.0 { |
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736 return Ok(false); |
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737 } |
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738 rev = self |
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739 .check_revision(base.into()) |
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740 .ok_or(RevlogError::InvalidRevision)?; |
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741 } |
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742 Ok(rev == NULL_REVISION) |
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743 } |
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744 |
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745 /// Return whether the given revision is a snapshot. Returns an error if |
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746 /// `rev` is not within a valid revision range. |
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747 pub fn is_snapshot( |
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748 &self, |
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749 rev: UncheckedRevision, |
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750 ) -> Result<bool, RevlogError> { |
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751 let rev = self |
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752 .check_revision(rev) |
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753 .ok_or_else(|| RevlogError::corrupted("test"))?; |
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754 self.is_snapshot_unchecked(rev) |
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755 } |
51218
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756 |
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757 /// Slice revs to reduce the amount of unrelated data to be read from disk. |
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758 /// |
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759 /// The index is sliced into groups that should be read in one time. |
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760 /// |
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761 /// The initial chunk is sliced until the overall density |
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762 /// (payload/chunks-span ratio) is above `target_density`. |
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763 /// No gap smaller than `min_gap_size` is skipped. |
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764 pub fn slice_chunk_to_density( |
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765 &self, |
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766 revs: &[Revision], |
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767 target_density: f64, |
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768 min_gap_size: usize, |
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769 ) -> Vec<Vec<Revision>> { |
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770 if revs.is_empty() { |
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771 return vec![]; |
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772 } |
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773 if revs.len() == 1 { |
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774 return vec![revs.to_owned()]; |
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775 } |
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776 let delta_chain_span = self.segment_span(revs); |
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777 if delta_chain_span < min_gap_size { |
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778 return vec![revs.to_owned()]; |
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779 } |
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780 let entries: Vec<_> = revs |
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781 .iter() |
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782 .map(|r| { |
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783 (*r, self.get_entry(*r).unwrap_or_else(|| self.null_entry())) |
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784 }) |
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785 .collect(); |
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786 |
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787 let mut read_data = delta_chain_span; |
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788 let chain_payload: u32 = |
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789 entries.iter().map(|(_r, e)| e.compressed_len()).sum(); |
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790 let mut density = if delta_chain_span > 0 { |
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791 chain_payload as f64 / delta_chain_span as f64 |
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792 } else { |
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793 1.0 |
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794 }; |
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795 |
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796 if density >= target_density { |
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797 return vec![revs.to_owned()]; |
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798 } |
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799 |
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800 // Store the gaps in a heap to have them sorted by decreasing size |
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801 let mut gaps = Vec::new(); |
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802 let mut previous_end = None; |
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803 |
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804 for (i, (_rev, entry)) in entries.iter().enumerate() { |
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805 let start = entry.c_start() as usize; |
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806 let length = entry.compressed_len(); |
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807 |
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808 // Skip empty revisions to form larger holes |
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809 if length == 0 { |
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810 continue; |
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811 } |
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812 |
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813 if let Some(end) = previous_end { |
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814 let gap_size = start - end; |
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815 // Only consider holes that are large enough |
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816 if gap_size > min_gap_size { |
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817 gaps.push((gap_size, i)); |
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818 } |
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819 } |
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820 previous_end = Some(start + length as usize); |
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821 } |
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822 if gaps.is_empty() { |
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823 return vec![revs.to_owned()]; |
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824 } |
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825 // sort the gaps to pop them from largest to small |
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826 gaps.sort_unstable(); |
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827 |
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828 // Collect the indices of the largest holes until |
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829 // the density is acceptable |
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830 let mut selected = vec![]; |
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831 while let Some((gap_size, gap_id)) = gaps.pop() { |
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832 if density >= target_density { |
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833 break; |
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834 } |
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835 selected.push(gap_id); |
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836 |
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837 // The gap sizes are stored as negatives to be sorted decreasingly |
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838 // by the heap |
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839 read_data -= gap_size; |
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840 density = if read_data > 0 { |
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841 chain_payload as f64 / read_data as f64 |
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842 } else { |
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843 1.0 |
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844 }; |
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845 if density >= target_density { |
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846 break; |
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847 } |
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848 } |
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849 selected.sort_unstable(); |
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850 selected.push(revs.len()); |
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851 |
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852 // Cut the revs at collected indices |
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853 let mut previous_idx = 0; |
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854 let mut chunks = vec![]; |
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855 for idx in selected { |
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856 let chunk = self.trim_chunk(&entries, previous_idx, idx); |
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857 if !chunk.is_empty() { |
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858 chunks.push(chunk.iter().map(|(rev, _entry)| *rev).collect()); |
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859 } |
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860 previous_idx = idx; |
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861 } |
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862 let chunk = self.trim_chunk(&entries, previous_idx, entries.len()); |
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863 if !chunk.is_empty() { |
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864 chunks.push(chunk.iter().map(|(rev, _entry)| *rev).collect()); |
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865 } |
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866 |
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867 chunks |
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868 } |
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869 |
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870 /// Get the byte span of a segment of sorted revisions. |
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871 /// |
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872 /// Occurrences of [`NULL_REVISION`] are ignored at the beginning of |
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873 /// the `revs` segment. |
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874 /// |
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875 /// panics: |
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876 /// - if `revs` is empty or only made of `NULL_REVISION` |
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877 /// - if cannot retrieve entry for the last or first not null element of |
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878 /// `revs`. |
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879 fn segment_span(&self, revs: &[Revision]) -> usize { |
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880 if revs.is_empty() { |
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881 return 0; |
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882 } |
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883 let last_entry = &self.get_entry(revs[revs.len() - 1]).unwrap(); |
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884 let end = last_entry.c_start() + last_entry.compressed_len() as u64; |
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885 let first_rev = revs.iter().find(|r| r.0 != NULL_REVISION.0).unwrap(); |
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886 let start = if (*first_rev).0 == 0 { |
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887 0 |
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888 } else { |
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889 self.get_entry(*first_rev).unwrap().c_start() |
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890 }; |
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891 (end - start) as usize |
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892 } |
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893 |
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894 /// Returns `&revs[startidx..endidx]` without empty trailing revs |
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895 fn trim_chunk<'a>( |
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896 &'a self, |
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897 revs: &'a [(Revision, IndexEntry)], |
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898 start: usize, |
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899 mut end: usize, |
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900 ) -> &'a [(Revision, IndexEntry)] { |
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901 // Trim empty revs at the end, except the very first rev of a chain |
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902 let last_rev = revs[end - 1].0; |
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903 if last_rev.0 < self.len() as BaseRevision { |
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904 while end > 1 |
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905 && end > start |
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906 && revs[end - 1].1.compressed_len() == 0 |
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907 { |
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908 end -= 1 |
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909 } |
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910 } |
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911 &revs[start..end] |
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912 } |
51220
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913 |
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914 /// Computes the set of revisions for each non-public phase from `roots`, |
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915 /// which are the last known roots for each non-public phase. |
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916 pub fn compute_phases_map_sets( |
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917 &self, |
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918 roots: HashMap<Phase, Vec<Revision>>, |
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919 ) -> Result<(usize, RootsPerPhase), GraphError> { |
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920 let mut phases = HashMap::new(); |
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921 let mut min_phase_rev = NULL_REVISION; |
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922 |
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923 for phase in Phase::non_public_phases() { |
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924 if let Some(phase_roots) = roots.get(phase) { |
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925 let min_rev = |
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926 self.add_roots_get_min(phase_roots, &mut phases, *phase); |
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927 if min_rev != NULL_REVISION |
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928 && (min_phase_rev == NULL_REVISION |
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929 || min_rev < min_phase_rev) |
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930 { |
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931 min_phase_rev = min_rev; |
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932 } |
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933 } else { |
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934 continue; |
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935 }; |
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936 } |
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937 let mut phase_sets: RootsPerPhase = Default::default(); |
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938 |
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939 if min_phase_rev == NULL_REVISION { |
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940 min_phase_rev = Revision(self.len() as BaseRevision); |
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941 } |
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942 |
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943 for rev in min_phase_rev.0..self.len() as BaseRevision { |
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944 let rev = Revision(rev); |
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945 let [p1, p2] = self.parents(rev)?; |
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946 |
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947 const DEFAULT_PHASE: &Phase = &Phase::Public; |
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948 if p1.0 >= 0 |
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949 && phases.get(&p1).unwrap_or(DEFAULT_PHASE) |
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950 > phases.get(&rev).unwrap_or(DEFAULT_PHASE) |
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951 { |
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952 phases.insert(rev, phases[&p1]); |
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953 } |
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954 if p2.0 >= 0 |
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955 && phases.get(&p2).unwrap_or(DEFAULT_PHASE) |
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956 > phases.get(&rev).unwrap_or(DEFAULT_PHASE) |
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957 { |
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958 phases.insert(rev, phases[&p2]); |
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959 } |
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960 let set = match phases.get(&rev).unwrap_or(DEFAULT_PHASE) { |
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961 Phase::Public => continue, |
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962 phase => &mut phase_sets[*phase as usize - 1], |
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963 }; |
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964 set.insert(rev); |
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965 } |
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966 |
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967 Ok((self.len(), phase_sets)) |
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968 } |
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969 |
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970 fn add_roots_get_min( |
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971 &self, |
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972 phase_roots: &[Revision], |
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973 phases: &mut HashMap<Revision, Phase>, |
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974 phase: Phase, |
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975 ) -> Revision { |
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976 let mut min_rev = NULL_REVISION; |
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977 |
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978 for root in phase_roots { |
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979 phases.insert(*root, phase); |
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980 if min_rev == NULL_REVISION || min_rev > *root { |
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981 min_rev = *root; |
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982 } |
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983 } |
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984 min_rev |
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985 } |
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986 |
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987 /// Return `(heads(::(<roots> and <roots>::<heads>)))` |
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988 /// If `include_path` is `true`, return `(<roots>::<heads>)`.""" |
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989 /// |
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990 /// `min_root` and `roots` are unchecked since they are just used as |
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991 /// a bound or for comparison and don't need to represent a valid revision. |
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992 /// In practice, the only invalid revision passed is the working directory |
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993 /// revision ([`i32::MAX`]). |
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994 pub fn reachable_roots( |
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995 &self, |
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996 min_root: UncheckedRevision, |
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997 mut heads: Vec<Revision>, |
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998 roots: HashSet<UncheckedRevision>, |
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999 include_path: bool, |
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1000 ) -> Result<HashSet<Revision>, GraphError> { |
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1001 if roots.is_empty() { |
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1002 return Ok(HashSet::new()); |
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1003 } |
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1004 let mut reachable = HashSet::new(); |
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1005 let mut seen = HashMap::new(); |
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1006 |
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1007 while let Some(rev) = heads.pop() { |
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1008 if roots.contains(&rev.into()) { |
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1009 reachable.insert(rev); |
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1010 if !include_path { |
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1011 continue; |
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1012 } |
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1013 } |
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1014 let parents = self.parents(rev)?; |
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1015 seen.insert(rev, parents); |
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1016 for parent in parents { |
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1017 if parent.0 >= min_root.0 && !seen.contains_key(&parent) { |
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1018 heads.push(parent); |
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1019 } |
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1020 } |
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1021 } |
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1022 if !include_path { |
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1023 return Ok(reachable); |
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1024 } |
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1025 let mut revs: Vec<_> = seen.keys().collect(); |
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1026 revs.sort_unstable(); |
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1027 for rev in revs { |
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1028 for parent in seen[rev] { |
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1029 if reachable.contains(&parent) { |
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1030 reachable.insert(*rev); |
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1031 } |
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1032 } |
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1033 } |
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1034 Ok(reachable) |
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1035 } |
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1036 |
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1037 /// Given a (possibly overlapping) set of revs, return all the |
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1038 /// common ancestors heads: `heads(::args[0] and ::a[1] and ...)` |
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1039 pub fn common_ancestor_heads( |
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1040 &self, |
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1041 revisions: &[Revision], |
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1042 ) -> Result<Vec<Revision>, GraphError> { |
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1043 // given that revisions is expected to be small, we find this shortcut |
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1044 // potentially acceptable, especially given that `hg-cpython` could |
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1045 // very much bypass this, constructing a vector of unique values from |
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1046 // the onset. |
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1047 let as_set: HashSet<Revision> = revisions.iter().copied().collect(); |
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1048 // Besides deduplicating, the C version also implements the shortcut |
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1049 // for `NULL_REVISION`: |
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1050 if as_set.contains(&NULL_REVISION) { |
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1051 return Ok(vec![]); |
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1052 } |
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1053 |
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1054 let revisions: Vec<Revision> = as_set.into_iter().collect(); |
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1055 |
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1056 if revisions.len() <= 63 { |
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1057 self.find_gca_candidates::<u64>(&revisions) |
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1058 } else { |
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1059 self.find_gca_candidates::<NonStaticPoisonableBitSet>(&revisions) |
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1060 } |
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1061 } |
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1062 |
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1063 pub fn ancestors( |
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1064 &self, |
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1065 revisions: &[Revision], |
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1066 ) -> Result<Vec<Revision>, GraphError> { |
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1067 self.find_deepest_revs(&self.common_ancestor_heads(revisions)?) |
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1068 } |
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1069 |
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1070 /// Given a disjoint set of revs, return all candidates for the |
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1071 /// greatest common ancestor. In revset notation, this is the set |
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1072 /// `heads(::a and ::b and ...)` |
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1073 fn find_gca_candidates<BS: PoisonableBitSet + Clone>( |
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1074 &self, |
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1075 revs: &[Revision], |
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1076 ) -> Result<Vec<Revision>, GraphError> { |
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1077 if revs.is_empty() { |
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1078 return Ok(vec![]); |
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1079 } |
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1080 let revcount = revs.len(); |
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1081 let mut candidates = vec![]; |
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1082 let max_rev = revs.iter().max().unwrap(); |
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1083 |
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1084 let mut seen = BS::vec_of_empty(revs.len(), (max_rev.0 + 1) as usize); |
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1085 |
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1086 for (idx, rev) in revs.iter().enumerate() { |
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1087 seen[rev.0 as usize].add(idx); |
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1088 } |
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1089 let mut current_rev = *max_rev; |
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1090 // Number of revisions whose inspection in the main loop |
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1091 // will give a result or trigger inspection of other revisions |
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1092 let mut interesting = revcount; |
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1093 |
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1094 // The algorithm works on a vector of bit sets, indexed by revision |
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1095 // numbers and iterated on reverse order. |
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1096 // An entry in this vector is poisoned if and only if the corresponding |
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1097 // revision is a common, yet not maximal ancestor. |
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1098 |
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1099 // The principle of the algorithm is as follows: |
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1100 // For a revision `r`, when entering the loop, `seen[r]` is either |
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1101 // poisoned or the sub set of `revs` of which `r` is an ancestor. |
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1102 // In this sub set is full, then `r` is a solution and its parents |
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1103 // have to be poisoned. |
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1104 // |
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1105 // At each iteration, the bit sets of the parents are updated by |
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1106 // union with `seen[r]`. |
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1107 // As we walk the index from the end, we are sure we have encountered |
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1108 // all children of `r` before `r`, hence we know that `seen[r]` is |
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1109 // fully computed. |
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1110 // |
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1111 // On top of that there are several optimizations that make reading |
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1112 // less obvious than the comment above: |
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1113 // - The `interesting` counter allows to break early |
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1114 // - The loop starts from `max(revs)` |
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1115 // - Early return in case it is detected that one of the incoming revs |
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1116 // is a common ancestor of all of them. |
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1117 while current_rev.0 >= 0 && interesting > 0 { |
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1118 let current_seen = seen[current_rev.0 as usize].clone(); |
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1119 |
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1120 if current_seen.is_empty() { |
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1121 current_rev = Revision(current_rev.0 - 1); |
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1122 continue; |
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1123 } |
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1124 let mut poison = current_seen.is_poisoned(); |
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1125 if !poison { |
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1126 interesting -= 1; |
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1127 if current_seen.is_full_range(revcount) { |
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1128 candidates.push(current_rev); |
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1129 poison = true; |
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1130 |
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1131 // Being a common ancestor, if `current_rev` is among |
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1132 // the input revisions, it is *the* answer. |
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1133 for rev in revs { |
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1134 if *rev == current_rev { |
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1135 return Ok(candidates); |
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1136 } |
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1137 } |
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1138 } |
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1139 } |
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1140 for parent in self.parents(current_rev)? { |
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1141 if parent == NULL_REVISION { |
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1142 continue; |
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1143 } |
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1144 let parent_seen = &seen[parent.0 as usize]; |
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1145 if !poison { |
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1146 // Without the `interesting` accounting, this block would |
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1147 // be logically equivalent to: parent_seen |= current_seen |
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1148 // The parent counts as interesting if it was not already |
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1149 // known to be an ancestor (would already have counted) |
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1150 if parent_seen.is_empty() { |
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1151 seen[parent.0 as usize] = current_seen.clone(); |
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1152 interesting += 1; |
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1153 } else if *parent_seen != current_seen { |
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1154 seen[parent.0 as usize].union(¤t_seen); |
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1155 } |
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1156 } else { |
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1157 // this block is logically equivalent to poisoning parent |
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1158 // and counting it as non interesting if it |
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1159 // has been seen before (hence counted then as interesting) |
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1160 if !parent_seen.is_empty() && !parent_seen.is_poisoned() { |
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1161 interesting -= 1; |
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1162 } |
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1163 seen[parent.0 as usize].poison(); |
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1164 } |
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1165 } |
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1166 |
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1167 current_rev = Revision(current_rev.0 - 1); |
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1168 } |
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1169 |
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1170 Ok(candidates) |
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1171 } |
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1172 |
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1173 /// Given a disjoint set of revs, return the subset with the longest path |
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1174 /// to the root. |
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1175 fn find_deepest_revs( |
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1176 &self, |
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1177 revs: &[Revision], |
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1178 ) -> Result<Vec<Revision>, GraphError> { |
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1179 // TODO replace this all with just comparing rank? |
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1180 // Also, the original implementations in C/Python are cryptic, not |
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1181 // even sure we actually need this? |
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1182 if revs.len() <= 1 { |
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1183 return Ok(revs.to_owned()); |
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1184 } |
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1185 let max_rev = revs.iter().max().unwrap().0; |
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1186 let mut interesting = HashMap::new(); |
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1187 let mut seen = vec![0; max_rev as usize + 1]; |
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1188 let mut depth = vec![0; max_rev as usize + 1]; |
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1189 let mut mapping = vec![]; |
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1190 let mut revs = revs.to_owned(); |
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1191 revs.sort_unstable(); |
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1192 |
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1193 for (idx, rev) in revs.iter().enumerate() { |
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1194 depth[rev.0 as usize] = 1; |
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1195 let shift = 1 << idx; |
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1196 seen[rev.0 as usize] = shift; |
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1197 interesting.insert(shift, 1); |
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1198 mapping.push((shift, *rev)); |
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1199 } |
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1200 |
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1201 let mut current_rev = Revision(max_rev); |
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1202 while current_rev.0 >= 0 && interesting.len() > 1 { |
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1203 let current_depth = depth[current_rev.0 as usize]; |
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1204 if current_depth == 0 { |
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1205 current_rev = Revision(current_rev.0 - 1); |
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1206 continue; |
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1207 } |
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1208 |
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1209 let current_seen = seen[current_rev.0 as usize]; |
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1210 for parent in self.parents(current_rev)? { |
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1211 if parent == NULL_REVISION { |
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1212 continue; |
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1213 } |
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1214 let parent_seen = seen[parent.0 as usize]; |
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1215 let parent_depth = depth[parent.0 as usize]; |
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1216 if parent_depth <= current_depth { |
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1217 depth[parent.0 as usize] = current_depth + 1; |
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1218 if parent_seen != current_seen { |
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1219 *interesting.get_mut(¤t_seen).unwrap() += 1; |
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1220 seen[parent.0 as usize] = current_seen; |
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1221 if parent_seen != 0 { |
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1222 let parent_interesting = |
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1223 interesting.get_mut(&parent_seen).unwrap(); |
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1224 *parent_interesting -= 1; |
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1225 if *parent_interesting == 0 { |
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1226 interesting.remove(&parent_seen); |
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1227 } |
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1228 } |
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1229 } |
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1230 } else if current_depth == parent_depth - 1 { |
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1231 let either_seen = parent_seen | current_seen; |
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1232 if either_seen == parent_seen { |
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1233 continue; |
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1234 } |
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1235 seen[parent.0 as usize] = either_seen; |
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1236 interesting |
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1237 .entry(either_seen) |
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1238 .and_modify(|v| *v += 1) |
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1239 .or_insert(1); |
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1240 *interesting.get_mut(&parent_seen).unwrap() -= 1; |
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1241 if interesting[&parent_seen] == 0 { |
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1242 interesting.remove(&parent_seen); |
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1243 } |
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1244 } |
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1245 } |
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1246 *interesting.get_mut(¤t_seen).unwrap() -= 1; |
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1247 if interesting[¤t_seen] == 0 { |
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1248 interesting.remove(¤t_seen); |
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1249 } |
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1250 |
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1251 current_rev = Revision(current_rev.0 - 1); |
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1252 } |
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1253 |
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1254 if interesting.len() != 1 { |
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1255 return Ok(vec![]); |
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1256 } |
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1257 let mask = interesting.keys().next().unwrap(); |
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1258 |
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1259 Ok(mapping |
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1260 .into_iter() |
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1261 .filter_map(|(shift, rev)| { |
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1262 if (mask & shift) != 0 { |
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1263 return Some(rev); |
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1264 } |
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1265 None |
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1266 }) |
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1267 .collect()) |
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1268 } |
51197
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1269 } |
51220
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1270 |
51224
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1271 /// The kind of functionality needed by find_gca_candidates |
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1272 /// |
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1273 /// This is a bit mask which can be declared to be "poisoned", which callers |
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1274 /// interpret to break out of some loops. |
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1275 /// |
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1276 /// The maximum capacity of the bit mask is up to the actual implementation |
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1277 trait PoisonableBitSet: Sized + PartialEq { |
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1278 /// Return a vector of exactly n elements, initialized to be empty. |
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1279 /// |
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1280 /// Optimization can vastly depend on implementation. Those being `Copy` |
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1281 /// and having constant capacity typically can have a very simple |
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1282 /// implementation. |
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1283 fn vec_of_empty(sets_size: usize, vec_len: usize) -> Vec<Self>; |
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1284 |
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1285 /// The size of the bit mask in memory |
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1286 fn size(&self) -> usize; |
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1287 |
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1288 /// The number of elements that can be represented in the set. |
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1289 /// |
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1290 /// Another way to put it is that it is the highest integer `C` such that |
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1291 /// the set is guaranteed to always be a subset of the integer range |
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1292 /// `[0, C)` |
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1293 fn capacity(&self) -> usize; |
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1294 |
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1295 /// Declare `n` to belong to the set |
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1296 fn add(&mut self, n: usize); |
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1297 |
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1298 /// Declare `n` not to belong to the set |
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1299 fn discard(&mut self, n: usize); |
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1300 |
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1301 /// Replace this bit set by its union with other |
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1302 fn union(&mut self, other: &Self); |
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1303 |
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1304 /// Poison the bit set |
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1305 /// |
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1306 /// Interpretation up to the caller |
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1307 fn poison(&mut self); |
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1308 |
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1309 /// Is the bit set poisoned? |
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1310 /// |
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1311 /// Interpretation is up to the caller |
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1312 fn is_poisoned(&self) -> bool; |
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1313 |
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1314 /// Is the bit set empty? |
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1315 fn is_empty(&self) -> bool; |
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1316 |
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1317 /// return `true` if and only if the bit is the full range `[0, n)` |
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1318 /// of integers |
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1319 fn is_full_range(&self, n: usize) -> bool; |
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1320 } |
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1321 |
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1322 const U64_POISON: u64 = 1 << 63; |
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1323 |
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1324 impl PoisonableBitSet for u64 { |
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1325 fn vec_of_empty(_sets_size: usize, vec_len: usize) -> Vec<Self> { |
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1326 vec![0u64; vec_len] |
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1327 } |
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1328 |
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1329 fn size(&self) -> usize { |
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1330 8 |
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1331 } |
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1332 |
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1333 fn capacity(&self) -> usize { |
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1334 63 |
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1335 } |
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1336 |
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1337 fn add(&mut self, n: usize) { |
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1338 (*self) |= 1u64 << n; |
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1339 } |
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1340 |
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1341 fn discard(&mut self, n: usize) { |
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1342 (*self) &= u64::MAX - (1u64 << n); |
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1343 } |
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1344 |
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1345 fn union(&mut self, other: &Self) { |
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1346 (*self) |= *other; |
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1347 } |
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1348 |
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1349 fn is_full_range(&self, n: usize) -> bool { |
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1350 *self + 1 == (1u64 << n) |
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1351 } |
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1352 |
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1353 fn is_empty(&self) -> bool { |
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1354 *self == 0 |
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1355 } |
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1356 |
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1357 fn poison(&mut self) { |
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1358 *self = U64_POISON; |
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1359 } |
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1360 |
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1361 fn is_poisoned(&self) -> bool { |
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1362 // equality comparison would be tempting but would not resist |
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1363 // operations after poisoning (even if these should be bogus). |
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1364 *self >= U64_POISON |
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1365 } |
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1366 } |
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1367 |
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1368 /// A poisonable bit set whose capacity is not known at compile time but |
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1369 /// is constant after initial construction |
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1370 /// |
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1371 /// This can be way further optimized if performance assessments (speed |
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1372 /// and/or RAM) require it. |
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1373 /// As far as RAM is concerned, for large vectors of these, the main problem |
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1374 /// would be the repetition of set_size in each item. We would need a trait |
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1375 /// to abstract over the idea of a vector of such bit sets to do better. |
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1376 #[derive(Clone, PartialEq)] |
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1377 struct NonStaticPoisonableBitSet { |
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1378 set_size: usize, |
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1379 bit_set: Vec<u64>, |
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1380 } |
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1381 |
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1382 /// Number of `u64` needed for a [`NonStaticPoisonableBitSet`] of given size |
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1383 fn non_static_poisonable_inner_len(set_size: usize) -> usize { |
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1384 1 + (set_size + 1) / 64 |
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1385 } |
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1386 |
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1387 impl NonStaticPoisonableBitSet { |
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1388 /// The index of the sub-bit set for the given n, and the index inside |
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1389 /// the latter |
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1390 fn index(&self, n: usize) -> (usize, usize) { |
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1391 (n / 64, n % 64) |
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1392 } |
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1393 } |
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1394 |
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1395 /// Mock implementation to ensure that the trait makes sense |
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1396 impl PoisonableBitSet for NonStaticPoisonableBitSet { |
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1397 fn vec_of_empty(set_size: usize, vec_len: usize) -> Vec<Self> { |
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1398 let tmpl = Self { |
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1399 set_size, |
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1400 bit_set: vec![0u64; non_static_poisonable_inner_len(set_size)], |
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1401 }; |
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1402 vec![tmpl; vec_len] |
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1403 } |
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1404 |
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1405 fn size(&self) -> usize { |
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1406 8 + self.bit_set.len() * 8 |
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1407 } |
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1408 |
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1409 fn capacity(&self) -> usize { |
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1410 self.set_size |
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1411 } |
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1412 |
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1413 fn add(&mut self, n: usize) { |
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1414 let (sub_bs, bit_pos) = self.index(n); |
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1415 self.bit_set[sub_bs] |= 1 << bit_pos |
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1416 } |
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1417 |
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1418 fn discard(&mut self, n: usize) { |
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1419 let (sub_bs, bit_pos) = self.index(n); |
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1420 self.bit_set[sub_bs] |= u64::MAX - (1 << bit_pos) |
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1421 } |
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1422 |
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1423 fn union(&mut self, other: &Self) { |
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1424 assert!( |
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1425 self.set_size == other.set_size, |
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1426 "Binary operations on bit sets can only be done on same size" |
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1427 ); |
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1428 for i in 0..self.bit_set.len() - 1 { |
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1429 self.bit_set[i] |= other.bit_set[i] |
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1430 } |
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1431 } |
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1432 |
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1433 fn is_full_range(&self, n: usize) -> bool { |
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1434 let (sub_bs, bit_pos) = self.index(n); |
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1435 self.bit_set[..sub_bs].iter().all(|bs| *bs == u64::MAX) |
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1436 && self.bit_set[sub_bs] == (1 << (bit_pos + 1)) - 1 |
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1437 } |
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1438 |
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1439 fn is_empty(&self) -> bool { |
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1440 self.bit_set.iter().all(|bs| *bs == 0u64) |
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1441 } |
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1442 |
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1443 fn poison(&mut self) { |
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1444 let (sub_bs, bit_pos) = self.index(self.set_size); |
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1445 self.bit_set[sub_bs] = 1 << bit_pos; |
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1446 } |
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1447 |
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1448 fn is_poisoned(&self) -> bool { |
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1449 let (sub_bs, bit_pos) = self.index(self.set_size); |
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1450 self.bit_set[sub_bs] >= 1 << bit_pos |
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1451 } |
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1452 } |
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1453 |
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1454 /// Set of roots of all non-public phases |
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1455 pub type RootsPerPhase = [HashSet<Revision>; Phase::non_public_phases().len()]; |
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1456 |
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1457 #[derive(Debug, Copy, Clone, PartialEq, Eq, Ord, PartialOrd, Hash)] |
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1458 pub enum Phase { |
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1459 Public = 0, |
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1460 Draft = 1, |
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1461 Secret = 2, |
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1462 Archived = 3, |
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1463 Internal = 4, |
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1464 } |
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1465 |
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1466 impl TryFrom<usize> for Phase { |
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1467 type Error = RevlogError; |
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1468 |
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1469 fn try_from(value: usize) -> Result<Self, Self::Error> { |
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1470 Ok(match value { |
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1471 0 => Self::Public, |
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1472 1 => Self::Draft, |
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1473 2 => Self::Secret, |
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1474 32 => Self::Archived, |
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1475 96 => Self::Internal, |
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1476 v => { |
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1477 return Err(RevlogError::corrupted(format!( |
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1478 "invalid phase value {}", |
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1479 v |
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1480 ))) |
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1481 } |
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1482 }) |
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1483 } |
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1484 } |
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1485 |
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1486 impl Phase { |
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1487 pub const fn all_phases() -> &'static [Self] { |
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1488 &[ |
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1489 Self::Public, |
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1490 Self::Draft, |
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1491 Self::Secret, |
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1492 Self::Archived, |
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1493 Self::Internal, |
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1494 ] |
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1495 } |
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1496 pub const fn non_public_phases() -> &'static [Self] { |
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1497 &[Self::Draft, Self::Secret, Self::Archived, Self::Internal] |
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1498 } |
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1499 } |
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1500 |
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1501 fn inline_scan(bytes: &[u8]) -> (usize, Vec<usize>) { |
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1502 let mut offset: usize = 0; |
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1503 let mut offsets = Vec::new(); |
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1504 |
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1505 while offset + INDEX_ENTRY_SIZE <= bytes.len() { |
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1506 offsets.push(offset); |
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1507 let end = offset + INDEX_ENTRY_SIZE; |
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1508 let entry = IndexEntry { |
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1509 bytes: &bytes[offset..end], |
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1510 offset_override: None, |
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1511 }; |
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1512 |
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1513 offset += INDEX_ENTRY_SIZE + entry.compressed_len() as usize; |
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1514 } |
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1515 (offset, offsets) |
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1516 } |
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1517 |
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1518 impl super::RevlogIndex for Index { |
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1519 fn len(&self) -> usize { |
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1520 self.len() |
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1521 } |
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1522 |
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1523 fn node(&self, rev: Revision) -> Option<&Node> { |
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1524 if rev == NULL_REVISION { |
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1525 return Some(&NULL_NODE); |
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1526 } |
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1527 self.get_entry(rev).map(|entry| entry.hash()) |
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1528 } |
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1529 } |
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1530 |
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1531 #[derive(Debug)] |
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1532 pub struct IndexEntry<'a> { |
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1533 bytes: &'a [u8], |
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1534 /// Allows to override the offset value of the entry. |
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1535 /// |
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1536 /// For interleaved index and data, the offset stored in the index |
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1537 /// corresponds to the separated data offset. |
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1538 /// It has to be overridden with the actual offset in the interleaved |
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1539 /// index which is just after the index block. |
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1540 /// |
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1541 /// For separated index and data, the offset stored in the first index |
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1542 /// entry is mixed with the index headers. |
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1543 /// It has to be overridden with 0. |
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1544 offset_override: Option<usize>, |
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1545 } |
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1546 |
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1547 impl<'a> IndexEntry<'a> { |
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1548 /// Return the offset of the data. |
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1549 pub fn offset(&self) -> usize { |
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1550 if let Some(offset_override) = self.offset_override { |
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1551 offset_override |
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1552 } else { |
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1553 let mut bytes = [0; 8]; |
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1554 bytes[2..8].copy_from_slice(&self.bytes[0..=5]); |
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1555 BigEndian::read_u64(&bytes[..]) as usize |
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1556 } |
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1557 } |
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1558 pub fn raw_offset(&self) -> u64 { |
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1559 BigEndian::read_u64(&self.bytes[0..8]) |
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1560 } |
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1561 |
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1562 /// Same result (except potentially for rev 0) as C `index_get_start()` |
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1563 fn c_start(&self) -> u64 { |
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1564 self.raw_offset() >> 16 |
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1565 } |
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1566 |
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1567 pub fn flags(&self) -> u16 { |
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1568 BigEndian::read_u16(&self.bytes[6..=7]) |
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1569 } |
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1570 |
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1571 /// Return the compressed length of the data. |
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1572 pub fn compressed_len(&self) -> u32 { |
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1573 BigEndian::read_u32(&self.bytes[8..=11]) |
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1574 } |
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1575 |
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1576 /// Return the uncompressed length of the data. |
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1577 pub fn uncompressed_len(&self) -> i32 { |
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1578 BigEndian::read_i32(&self.bytes[12..=15]) |
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1579 } |
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1580 |
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1581 /// Return the revision upon which the data has been derived. |
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1582 pub fn base_revision_or_base_of_delta_chain(&self) -> UncheckedRevision { |
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1583 // TODO Maybe return an Option when base_revision == rev? |
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1584 // Requires to add rev to IndexEntry |
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1585 |
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1586 BigEndian::read_i32(&self.bytes[16..]).into() |
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1587 } |
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1588 |
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1589 pub fn link_revision(&self) -> UncheckedRevision { |
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1590 BigEndian::read_i32(&self.bytes[20..]).into() |
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1591 } |
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1592 |
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1593 pub fn p1(&self) -> UncheckedRevision { |
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1594 BigEndian::read_i32(&self.bytes[24..]).into() |
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1595 } |
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1596 |
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1597 pub fn p2(&self) -> UncheckedRevision { |
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1598 BigEndian::read_i32(&self.bytes[28..]).into() |
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1599 } |
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1600 |
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|
1601 /// Return the hash of revision's full text. |
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1602 /// |
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|
1603 /// Currently, SHA-1 is used and only the first 20 bytes of this field |
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|
1604 /// are used. |
46090
9eb07ab3f2d4
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Simon Sapin <simon-commits@exyr.org>
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|
1605 pub fn hash(&self) -> &'a Node { |
46033
88e741bf2d93
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Simon Sapin <simon-commits@exyr.org>
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|
1606 (&self.bytes[32..52]).try_into().unwrap() |
45531
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|
1607 } |
51203
7434747343ab
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Raphaël Gomès <rgomes@octobus.net>
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|
1608 |
7434747343ab
rust-index: check that the entry bytes are the same in both indexes
Raphaël Gomès <rgomes@octobus.net>
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|
1609 pub fn as_bytes(&self) -> &'a [u8] { |
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rust-index: check that the entry bytes are the same in both indexes
Raphaël Gomès <rgomes@octobus.net>
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|
1610 self.bytes |
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|
1611 } |
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1612 } |
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1613 |
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|
1614 #[cfg(test)] |
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|
1615 mod tests { |
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|
1616 use super::*; |
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|
1617 use crate::node::NULL_NODE; |
45526
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|
1618 |
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|
1619 #[cfg(test)] |
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|
1620 #[derive(Debug, Copy, Clone)] |
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|
1621 pub struct IndexEntryBuilder { |
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|
1622 is_first: bool, |
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|
1623 is_inline: bool, |
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Antoine Cezar <antoine.cezar@octobus.net>
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|
1624 is_general_delta: bool, |
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|
1625 version: u16, |
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|
1626 offset: usize, |
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|
1627 compressed_len: usize, |
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Antoine Cezar <antoine.cezar@octobus.net>
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|
1628 uncompressed_len: usize, |
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Arseniy Alekseyev <aalekseyev@janestreet.com>
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|
1629 base_revision_or_base_of_delta_chain: Revision, |
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|
1630 link_revision: Revision, |
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|
1631 p1: Revision, |
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|
1632 p2: Revision, |
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|
1633 node: Node, |
45526
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1634 } |
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1635 |
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|
1636 #[cfg(test)] |
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Antoine Cezar <antoine.cezar@octobus.net>
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|
1637 impl IndexEntryBuilder { |
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0780371d6b1e
rust-clippy: tell `clippy` we don't need to declare a default here
Raphaël Gomès <rgomes@octobus.net>
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|
1638 #[allow(clippy::new_without_default)] |
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|
1639 pub fn new() -> Self { |
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1640 Self { |
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|
1641 is_first: false, |
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|
1642 is_inline: false, |
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|
1643 is_general_delta: true, |
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rust-revlog: change default version from 2 to 1 in test builder
Martin von Zweigbergk <martinvonz@google.com>
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|
1644 version: 1, |
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|
1645 offset: 0, |
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|
1646 compressed_len: 0, |
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|
1647 uncompressed_len: 0, |
50979
4c5f6e95df84
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Raphaël Gomès <rgomes@octobus.net>
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|
1648 base_revision_or_base_of_delta_chain: Revision(0), |
4c5f6e95df84
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Raphaël Gomès <rgomes@octobus.net>
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|
1649 link_revision: Revision(0), |
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|
1650 p1: NULL_REVISION, |
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|
1651 p2: NULL_REVISION, |
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|
1652 node: NULL_NODE, |
45526
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|
1653 } |
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|
1654 } |
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|
1655 |
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Antoine Cezar <antoine.cezar@octobus.net>
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|
1656 pub fn is_first(&mut self, value: bool) -> &mut Self { |
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|
1657 self.is_first = value; |
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Antoine Cezar <antoine.cezar@octobus.net>
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|
1658 self |
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|
1659 } |
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|
1660 |
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|
1661 pub fn with_inline(&mut self, value: bool) -> &mut Self { |
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|
1662 self.is_inline = value; |
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Antoine Cezar <antoine.cezar@octobus.net>
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|
1663 self |
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|
1664 } |
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|
1665 |
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|
1666 pub fn with_general_delta(&mut self, value: bool) -> &mut Self { |
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|
1667 self.is_general_delta = value; |
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|
1668 self |
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|
1669 } |
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|
1670 |
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|
1671 pub fn with_version(&mut self, value: u16) -> &mut Self { |
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|
1672 self.version = value; |
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|
1673 self |
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|
1674 } |
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|
1675 |
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|
1676 pub fn with_offset(&mut self, value: usize) -> &mut Self { |
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|
1677 self.offset = value; |
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|
1678 self |
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|
1679 } |
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|
1680 |
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|
1681 pub fn with_compressed_len(&mut self, value: usize) -> &mut Self { |
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|
1682 self.compressed_len = value; |
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|
1683 self |
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|
1684 } |
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|
1685 |
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|
1686 pub fn with_uncompressed_len(&mut self, value: usize) -> &mut Self { |
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|
1687 self.uncompressed_len = value; |
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1688 self |
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1689 } |
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1690 |
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|
1691 pub fn with_base_revision_or_base_of_delta_chain( |
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1692 &mut self, |
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1693 value: Revision, |
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|
1694 ) -> &mut Self { |
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|
1695 self.base_revision_or_base_of_delta_chain = value; |
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1696 self |
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1697 } |
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1698 |
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|
1699 pub fn with_link_revision(&mut self, value: Revision) -> &mut Self { |
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|
1700 self.link_revision = value; |
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1701 self |
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1702 } |
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1703 |
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|
1704 pub fn with_p1(&mut self, value: Revision) -> &mut Self { |
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|
1705 self.p1 = value; |
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1706 self |
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1707 } |
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1708 |
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|
1709 pub fn with_p2(&mut self, value: Revision) -> &mut Self { |
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|
1710 self.p2 = value; |
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1711 self |
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1712 } |
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|
1713 |
2a9a55ffe24f
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Martin von Zweigbergk <martinvonz@google.com>
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|
1714 pub fn with_node(&mut self, value: Node) -> &mut Self { |
2a9a55ffe24f
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Martin von Zweigbergk <martinvonz@google.com>
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|
1715 self.node = value; |
2a9a55ffe24f
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Martin von Zweigbergk <martinvonz@google.com>
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|
1716 self |
2a9a55ffe24f
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Martin von Zweigbergk <martinvonz@google.com>
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|
1717 } |
2a9a55ffe24f
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Martin von Zweigbergk <martinvonz@google.com>
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|
1718 |
45526
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|
1719 pub fn build(&self) -> Vec<u8> { |
26c53ee51c68
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Antoine Cezar <antoine.cezar@octobus.net>
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|
1720 let mut bytes = Vec::with_capacity(INDEX_ENTRY_SIZE); |
26c53ee51c68
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|
1721 if self.is_first { |
26c53ee51c68
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Antoine Cezar <antoine.cezar@octobus.net>
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|
1722 bytes.extend(&match (self.is_general_delta, self.is_inline) { |
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Antoine Cezar <antoine.cezar@octobus.net>
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|
1723 (false, false) => [0u8, 0], |
26c53ee51c68
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Antoine Cezar <antoine.cezar@octobus.net>
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|
1724 (false, true) => [0u8, 1], |
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Antoine Cezar <antoine.cezar@octobus.net>
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|
1725 (true, false) => [0u8, 2], |
26c53ee51c68
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Antoine Cezar <antoine.cezar@octobus.net>
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|
1726 (true, true) => [0u8, 3], |
26c53ee51c68
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Antoine Cezar <antoine.cezar@octobus.net>
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|
1727 }); |
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|
1728 bytes.extend(&self.version.to_be_bytes()); |
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1729 // Remaining offset bytes. |
26c53ee51c68
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|
1730 bytes.extend(&[0u8; 2]); |
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Antoine Cezar <antoine.cezar@octobus.net>
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1731 } else { |
46887
6d5a26e94d9e
unit-tests: Fix `cargo test` on 32-bit platforms
Simon Sapin <simon.sapin@octobus.net>
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|
1732 // Offset stored on 48 bits (6 bytes) |
6d5a26e94d9e
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Simon Sapin <simon.sapin@octobus.net>
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|
1733 bytes.extend(&(self.offset as u64).to_be_bytes()[2..]); |
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|
1734 } |
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1735 bytes.extend(&[0u8; 2]); // Revision flags. |
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|
1736 bytes.extend(&(self.compressed_len as u32).to_be_bytes()); |
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|
1737 bytes.extend(&(self.uncompressed_len as u32).to_be_bytes()); |
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rhg: fix a crash on non-generaldelta revlogs
Arseniy Alekseyev <aalekseyev@janestreet.com>
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|
1738 bytes.extend( |
50979
4c5f6e95df84
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Raphaël Gomès <rgomes@octobus.net>
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|
1739 &self.base_revision_or_base_of_delta_chain.0.to_be_bytes(), |
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1740 ); |
50979
4c5f6e95df84
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|
1741 bytes.extend(&self.link_revision.0.to_be_bytes()); |
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|
1742 bytes.extend(&self.p1.0.to_be_bytes()); |
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|
1743 bytes.extend(&self.p2.0.to_be_bytes()); |
49093
2a9a55ffe24f
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|
1744 bytes.extend(self.node.as_bytes()); |
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|
1745 bytes.extend(vec![0u8; 12]); |
45526
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|
1746 bytes |
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|
1747 } |
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1748 } |
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1749 |
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1750 pub fn is_inline(index_bytes: &[u8]) -> bool { |
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1751 IndexHeader::parse(index_bytes) |
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|
1752 .expect("too short") |
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rust-revlog: teach the revlog opening code to read the repo options
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1753 .unwrap() |
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1754 .format_flags() |
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|
1755 .is_inline() |
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1756 } |
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1757 |
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1758 pub fn uses_generaldelta(index_bytes: &[u8]) -> bool { |
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1759 IndexHeader::parse(index_bytes) |
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|
1760 .expect("too short") |
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Raphaël Gomès <rgomes@octobus.net>
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|
1761 .unwrap() |
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1762 .format_flags() |
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1763 .uses_generaldelta() |
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1764 } |
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|
1765 |
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1766 pub fn get_version(index_bytes: &[u8]) -> u16 { |
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1767 IndexHeader::parse(index_bytes) |
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1768 .expect("too short") |
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1769 .unwrap() |
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1770 .format_version() |
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1771 } |
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|
1772 |
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1773 #[test] |
48457
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1774 fn flags_when_no_inline_flag_test() { |
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1775 let bytes = IndexEntryBuilder::new() |
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1776 .is_first(true) |
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1777 .with_general_delta(false) |
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|
1778 .with_inline(false) |
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|
1779 .build(); |
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|
1780 |
49930
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|
1781 assert!(!is_inline(&bytes)); |
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1782 assert!(!uses_generaldelta(&bytes)); |
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1783 } |
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1784 |
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|
1785 #[test] |
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1786 fn flags_when_inline_flag_test() { |
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|
1787 let bytes = IndexEntryBuilder::new() |
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1788 .is_first(true) |
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1789 .with_general_delta(false) |
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1790 .with_inline(true) |
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1791 .build(); |
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1792 |
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1793 assert!(is_inline(&bytes)); |
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1794 assert!(!uses_generaldelta(&bytes)); |
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1795 } |
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1796 |
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|
1797 #[test] |
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1798 fn flags_when_inline_and_generaldelta_flags_test() { |
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1799 let bytes = IndexEntryBuilder::new() |
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1800 .is_first(true) |
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1801 .with_general_delta(true) |
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1802 .with_inline(true) |
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1803 .build(); |
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1804 |
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1805 assert!(is_inline(&bytes)); |
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1806 assert!(uses_generaldelta(&bytes)); |
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1807 } |
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1808 |
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|
1809 #[test] |
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1810 fn test_offset() { |
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|
1811 let bytes = IndexEntryBuilder::new().with_offset(1).build(); |
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1812 let entry = IndexEntry { |
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1813 bytes: &bytes, |
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|
1814 offset_override: None, |
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|
1815 }; |
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|
1816 |
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|
1817 assert_eq!(entry.offset(), 1) |
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1818 } |
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1819 |
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1820 #[test] |
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1821 fn test_with_overridden_offset() { |
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1822 let bytes = IndexEntryBuilder::new().with_offset(1).build(); |
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1823 let entry = IndexEntry { |
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1824 bytes: &bytes, |
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1825 offset_override: Some(2), |
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1826 }; |
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1827 |
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1828 assert_eq!(entry.offset(), 2) |
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1829 } |
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1830 |
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1831 #[test] |
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1832 fn test_compressed_len() { |
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1833 let bytes = IndexEntryBuilder::new().with_compressed_len(1).build(); |
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1834 let entry = IndexEntry { |
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1835 bytes: &bytes, |
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1836 offset_override: None, |
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1837 }; |
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1838 |
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1839 assert_eq!(entry.compressed_len(), 1) |
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1840 } |
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1841 |
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1842 #[test] |
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1843 fn test_uncompressed_len() { |
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1844 let bytes = IndexEntryBuilder::new().with_uncompressed_len(1).build(); |
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1845 let entry = IndexEntry { |
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1846 bytes: &bytes, |
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1847 offset_override: None, |
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1848 }; |
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1849 |
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1850 assert_eq!(entry.uncompressed_len(), 1) |
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1851 } |
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1852 |
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1853 #[test] |
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1854 fn test_base_revision_or_base_of_delta_chain() { |
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1855 let bytes = IndexEntryBuilder::new() |
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1856 .with_base_revision_or_base_of_delta_chain(Revision(1)) |
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1857 .build(); |
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1858 let entry = IndexEntry { |
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1859 bytes: &bytes, |
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1860 offset_override: None, |
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1861 }; |
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1862 |
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1863 assert_eq!(entry.base_revision_or_base_of_delta_chain(), 1.into()) |
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1864 } |
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1865 |
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1866 #[test] |
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1867 fn link_revision_test() { |
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1868 let bytes = IndexEntryBuilder::new() |
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1869 .with_link_revision(Revision(123)) |
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1870 .build(); |
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1871 |
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1872 let entry = IndexEntry { |
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1873 bytes: &bytes, |
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1874 offset_override: None, |
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1875 }; |
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1876 |
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1877 assert_eq!(entry.link_revision(), 123.into()); |
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1878 } |
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1879 |
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1880 #[test] |
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1881 fn p1_test() { |
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1882 let bytes = IndexEntryBuilder::new().with_p1(Revision(123)).build(); |
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1883 |
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1884 let entry = IndexEntry { |
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1885 bytes: &bytes, |
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1886 offset_override: None, |
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1887 }; |
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1888 |
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1889 assert_eq!(entry.p1(), 123.into()); |
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1890 } |
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1891 |
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1892 #[test] |
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1893 fn p2_test() { |
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1894 let bytes = IndexEntryBuilder::new().with_p2(Revision(123)).build(); |
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1895 |
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1896 let entry = IndexEntry { |
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1897 bytes: &bytes, |
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1898 offset_override: None, |
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1899 }; |
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1900 |
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1901 assert_eq!(entry.p2(), 123.into()); |
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1902 } |
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1903 |
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1904 #[test] |
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1905 fn node_test() { |
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1906 let node = Node::from_hex("0123456789012345678901234567890123456789") |
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1907 .unwrap(); |
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1908 let bytes = IndexEntryBuilder::new().with_node(node).build(); |
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1909 |
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1910 let entry = IndexEntry { |
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1911 bytes: &bytes, |
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1912 offset_override: None, |
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1913 }; |
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1914 |
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1915 assert_eq!(*entry.hash(), node); |
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1916 } |
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1917 |
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1918 #[test] |
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1919 fn version_test() { |
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1920 let bytes = IndexEntryBuilder::new() |
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1921 .is_first(true) |
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1922 .with_version(2) |
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1923 .build(); |
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1924 |
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1925 assert_eq!(get_version(&bytes), 2) |
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1926 } |
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1927 } |
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1928 |
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1929 #[cfg(test)] |
26c53ee51c68
hg-core: Add a limited read only `revlog` implementation
Antoine Cezar <antoine.cezar@octobus.net>
parents:
diff
changeset
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1930 pub use tests::IndexEntryBuilder; |